Implementing pagination when exposing PSQuery as Web Service (QAS)

while exposing a PSQuery as a webservice i have a scenario where if there are total 100 records to be fetched from PS, then fetch/show 10 results/rows at a time. So we found a way to restrict the overall result set using PSQuery based on ROWNUM function, but it helps only for first result set, and doesn't help for subsequent sets of data.

Request you to let us know how can we support pagination when we expose a PSQuery as a Web Service (QAS).